Ore-concentrator.



BATENTBD SEPT. 20, 1904.

A. GUIONNEAU.

ORE GONUENTRATOR.

APPLIGATION I'ILED'MAY 2a. 1903.

5 SHEETS-BEBE! 1.

N0 MODEL,

PATENTED SEPT. 20, 1904.

A. GUIONNEAU. ORE CONGENTRATOR.

APPLIGATION rum) MAY as, 1903.

5 BHEETB-BHEET 2.

NO MODEL.

v No. 770,283. 7 PATENTBD SEPT. 20, 1904.

A. GUIO NNEAU.

ORE GONGENTRATOR.

APPLICATION FILED MAY 23, 1903.

NO MODEL. 5 SHEETS-SEEP! 3.

@Qffiwg gjir N0. 770,283- PATENTED SEPT. 20, 1904.

A. GUIONNEAU. ORE GONGENTRATOR.

T LE 23 1903. N0 MODEL: APPLIOA ION PI D MAY I 5 SHEETS-SHEB-T 4.

l M Q PATENTED SEPT. 20, 1904.

cm T B E H a 8 T B E H 5 3 0 m MM U vE N NNB EL I H N G00 fl ABA m 0?. P A

N0 MODEL.

v 7 w T 2 3 9A 5 a w i z rection of the arrow.

1 UNITED STATES Patented September 20, 1904.

PATENT OEEIcE.

ABEL GUIONNEAU, OF DENVER, COLORADO, ASSIGNOR OF TWO- THIRDS TO CHARLES M. FUELLER AND ROBER" J. CORY, OF

DENVER, COLORADO.

ORE-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 770,283, dated September 20, 1904,

Application filed May 23,1903. Serial No. 158,487. No model.)

To all whom, it Wtay concern:

Be it known that I, ABEL GUIONNEAU, a citi- Zen of the United States of America, residing in the city and county ofDenver, State of Colorado, have invented certain new and useful Improvements in Ore-Concentrators; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in concentrators; and the object of my invention is to provide a concentrator consisting of a table concentrating-surface provided with a smooth flat surface in which a plurality of inverted conical cups are arranged in rows from the head end of the table to near its discharge end, each row of cups being connected by a groove or riflle which forms a continuous passage from one cup to the other throughout the length of the row.

Referring to the accompanying drawings, Figure 1 designates a plan View of my improved concentrator. Fig. 2 designates a side elevation of Fig. 1. Fig. 8 is an enlarged end elevation of the first table and'a section on line 3 3 of Fig. 1. Fig. 4 is a plan View ofaconcentrating-table embodying my invention. Fig. 5 is a sectional elevation of the adjustable variable-stroke table-reciprocating mechanism. Fig. 6 is an end elevation of Fig. 5 looking in thev direction of the arrow A. Fig. 7 is a section of Fig. 5 on line 7 7 in the di- Fig. 8 is a plan view of the rock-arm and the cam-roller of the driving mechanism shown inFig. 5. Fig. 9 is a partially-sectional view of the pivotal bolt on which the cam-roller rotates. Fig. 10 is a plan view of the top edge of one of the tables supporting-standards. Fig. 11 is a plan view of the feet and lower edge of one of the tables supporting-standards. Fig. 12 is a fragmentary sectional View of a table, showing one of the tables supporting-standards and its knifeedge bearings. Fig. 13 is a side elevation of one of the tables tilting-screws. Fig. 14 is a sectional view of the cap in which the knifeedge of the tilting-screw rests. Fig. 15 is a cross-section of Fig. 14. Fig. 16 is a side elevation of the knife-edge block on which the feet of the standards rest. view of Fig. 16. Fig. 18 is a fragmentary view of the discharge end of one of the tables of my triplicate or multiple table concentrator, showing the discharge end and concentratesdischarging apron and the concentrates-receiving box and the slidable separator for separating two different metals and dividing the concentrates from each other as they discharge from the table into the concentrates-box. Fig. 19 is a longitudinal section of the separator; and Fig. 20 is an enlarged fragmentary longitudinal section through the table, through the center of one of the rows of cups, and the rifiie that extends through them.

Similar numerals of reference refer to similar parts throughout the several views.

Referring to the drawings, the numerals 1, 2, and 3 designate the tables of my multipletable concentrator, and as all the tables in a concentrator embodying my invention are alike and also their driving and tilting mechanism a description of the construction of one will apply to the other tables of the concentrator.

I preferably make the concentrator-table rectangular in shape, and the concentratingsurfaces may be made of any suitable mate rial, such as metal or wood or rubber. I preferably, however, make the concentratingsurface of the tables out of California redwood. I make the top of the surface of the tables flat and smooth. One side 2 is provided with a rail 3, and this side I term the feed side of the table, and at the head end or feed end 4 of the table I place a rail 5. At

the corner of the head-end rail 5 and the feedside rail 3 I secure a suitablehopper 6, from which ore-pulp is distributed over the tables, as will be explained hereinafter.

The discharge end 7 of the table is provided with an apron 8, which extends across the discharge end of the table even with the top Fig. 17 is an end of the tables surface. This apron preferably comprises a thin sheet of metal bent into an angle, one arm, 9, of which is secured to the edge of the table. The other arm projects from the end of the table and forms the apron 8. The feed side 2 of the table extends along the side rail 3, and the tailings-discharge side 10 of the table is an open side and is provided with an apron 11, which extends along it from its discharge end a predetermined distance, preferably about one-third of its length, and

guides the middlings portion of the ore-pulp.

that flows across the table into the next table of the concentrator. This apron is made wide enough to allow the entire width of the middlings portion of the ore-pulp to flow over it without breaking up the stratification assumed by the ore-pulp by the time it has moved across the table to the apron. This apron projects from the side of the first and second tables at a rearward angle corresponding substantially to the line of movement of the ore-pulp across the tables. Just below the edge of the tailings-discharge side 10 a launder 11 is placed, which extends from the apron along the side of the table to its head end. A discharge-aperture 11 is placed in the launder, and the tailings of the ore-pulp fiow into the launder and are led away from it and run to waste.

In the surface of the table I form a plurality of cups or recesses 12, which I preferably make of a circular inverted-cone shape. I preferably arrange these cups in tapering rows 13, 14:, 15, and 16, each row extending from the head end of the table to within a short distance of its discharge end 7, and the cups of each row are positioned to stand between the cups of the adjacent rows or in alternate order, so that the surface of the table is fully broken up by the cups, thus making it impossible for ore-pulp to fiow across the table without filling them. These cups comprise a circular conical recess cut or pressed in the surface of the table, the sides of which converge at a flat angle toward the center of the recess, in the center or bottom of which a circular hole 17 isformed that extends from the bottom of the conical cup deeper into the surface of the table. These cups vary in diameter and in depth in successive order from the head end of the row, which is located at the head end of the table, to the discharge end of each row of cups and in such proportion that assuming that the largest cups at the head end of each row are six inches in diameter and three-eighths of an inch in depth the cup at the end of each row would be about two inches in diameter and but just the slightest recess, not exceeding an eighth of an inch in depth. A grooved rifile 18 is formed through each row of cups and the surface of the table and extends from the top edge of the center hole 17 of the head-end cup to the center hole 17 of the dischargingamass cup. The cups in each row taper in their width and also in their depth from their head end to their discharge end, while the rifiie, which is of preferably even width, tapers upward from the head-end cup to the dischargeend cup of each row of cups. Each row of cups extends at a different angle from the others along the length of the table from the head end 1 toward the discharge end 7. Thus the row 16 of cups along the discharge-rail of the table is positioned preferably parallel with the longitudinal length of the table. The row 15 stands at a slightly-converging angle toward the discharge end from its head end, the row 14 at a still greater similar converging' angle than the row 15, and the row 13 at a still greater converging angle toward the discharge-rail from its head end and from the feed-rail side of the table than the rows 15 and 14:. I fill the hole 17 in the bottom of each cup wholly or partially full of mercury.

These cups catch and hold the mineral parti cles of the ore-pulp as the ore-pulp flows across the table, while any particles of free gold that are caught by the cups work into the mercury and amalgamate with it, as will be explained more fully hereinafter. Along the feed side of the table close to the rail 2 I support in any convenient manner water-distributing pipes 19 and 19*. These pipes are preferably supported just inside of the feedside rail by a support independent of the table and may be supported from above or by a stand secured to the floor. I do not show a support for the pipes, however, as it does not form a part of my invention. The pipes 19 and 19 are provided with a large number of small holes 20, arranged in a straight row and positioned and adapted to discharge small jets of water on the table close to the feedside rail 3. Their inner ends are connected to a T 21, and caps 20 and 21 are threaded to their outer ends. A nipple 22 is threaded to the T and avalve 22 is threaded to the nipple. From the valve a pipe 22 leads to a supply of clear water. I also provide each one of the tables in the concentrator with -a similar water-distributing supply-pipe system, which I arrange in a similar manner and in the same position on each table in order that each table may have an independent valve-controlled water-supply. Each table rests on two standards 23 and 23 placed one at each end. thin openly-framed casting. The opposite corners of one end of the standards are pro vided with feet portions 24:, which are provided with inverted-V-shaped recesses 25 and rest on the tops of knife-edge blocks 26, which are secured to the floor by bolts 27. Theopposite ends of the standards are provided at their top portions with projecting lugs 27 each of which is provided'with a vertical hole 28, in which is slidingly fitted a rod 29, which I term the tilting-rod. A short distance These standards comprise a below the lugs a recess 30 is made in each edge of the standard. These recesses are arranged substantially opposite each other and are adapted to receive the wheels 29 and 30. The holes 28 in the standards extend down into the standard across the recesses and are preferably made in two diameters, the portion below the recesses being the smallest to permit the table-tilting rods to be inserted from above. The tilting-rods are also made in three diameters, the largest fitting the larger hole in the top lugs, a central portion of smaller diameter, which is threaded, and an end portion, which fits slidably the smaller hole in the standard below the recess. These handwheels are threaded to the threaded portion 31 on the adjusting screw-rods 29. The hubs of the hand-wheels rest on the bottom of the recesses, and the tilting-rods can be raised or lowered to tilt the table by turning the handwheels. The opposite ends of the tilting-rods are provided with a curved wedge-shaped or knife-edge head portion 32. To the under side of each of the four corners of the table I secure a block 32, in which is formed an inverted-V-shaped recess 33, which fits over and rests on the knife-edges of the tables tiltingrods, thus forming an adjustable knife-edge bearing for each corner of each table to rest upon, which each standard at the opposite end of each table also rests upon knife-edge bearings, thus insuring a firm support for each table upon bearings that allow the tables a very free easy reciprocal movement and that are subject to very little wear,'while the tilting-rods permit any one corner on either side to be tilted to obtain for the surface of the table any desired inclination, thus enabling the table to be adjusted as to inclination to successfully treat ores of widely different characters and specific gravities.

I set the tables of the concentrator in overlapping side-by-side order and also in clownward step-by-step order, so that the second table stands below the first table far enough to allow the apron of the first table to extend over the head portion of the second table along its feed-side rail and discharge its middlings at the head end and along the feed side of the second table, and the third table is positioned in the same relation to the second table, so that it receives the middlings from the second table, and as many tables may be added as desired, as, while I only illustrate three tables as comprising a complete concentrator, my invention contemplates the use of as many tables as desired.

I consider each table a unit of a complete concentrator, while the whole number of tables that I arrange in a set, as shown in Figs. 1, 2, and 3, acting cooperatingly togetherI consider a complete concentrator.

As the middlings ore pulp (by which is meant that portion of the ore-pulp from which the mineral particles have not been separated) to the frame at the apex of its arms.

that flows from the first table to the second is but a fractional part of the amount of orepulp that flows over the first table, as this first table has discharged all the tailings portion ofv the ore-pulp as it flows across it and also the clear concentrates that the table has separated from the ore-pulp, the second table should have a variable-speed and adjustable-stroke driving mechanism that will permit of a speed and reciprocating movement independent of the first table, and as the third table receives a less amount of middlings ore-pulp from the second table than the second. does from the first table this table also requires an independent variable-speed and adjustable-stroke driving mechanism. Consequently each table in order that it may be manipulated to accomplish a perfect separation and concentration of the ore material flowing onto it must have an independent variable-speed and adjustable-stroke driving mechanism. I preferably carry out this feature of my invention in the following manner: At the head end of each table I place suitable supporting-benches 34, 35, and 36, which rest on sills 37, 38, and 39, which are framed together at their ends to form a bedplate for the benches. These benches comprise, as illustrated, suitable timber structures strongly framed together and into the sills. To the top of each bench I secure the reciprocating mechanism of each table, arranging them substantially in, the center of the width of each table at their head ends. As these driving mechanisms are all alike, a description of one will apply to all. GonsequentlyI will confine the description to the driving mechanism of the first table. ism consists of a base-plate 41, which is secured by bolts 42 to the benches. The bedplate is provided with a central slot, and from one end of the top of the bed-plate on each side of the slot a yoke-shaped standard 43 projects vertically upward. I provide the bedplate close to the standard with journal-boxes 44, in which I mount a shaft 45. On the shaft in the slot of the bed-plate I secure a cam 46. I also form on the opposite end of the frame from the standard boxes 46, in whichI pivotally mount a rock-arm'47, which is of substantially V shape and is pivotally connecged ne arm, 48, extends over the cam, and its end is forked, and between the forked end portions a roller 49 is rotatably mounted on a studbolt 50, which is bolted through the forked ends of the rock-arm.

The stud-bolt 50 is provided with an oilpassage 51, which extends axially into it from one end and emerges through its side in the central portion of the roller. The entrance end of this oil-passage is threaded, and an oilcup, which I do not illustrate, may be operatively secured to it.

The roller is arranged to bear on the peripheral surface of the cam, which is adapted The driving mechanto impart an oscillating or rocking motion to the rock-arm. To accomplish this, the cam, which is of a circular disk shape, is provided at three-quarters of the circumference of its periphery with a gradually-increasing radial portion 52, while the remaining one-quarter portion 52 of the circumference of the periphery converges to a radial portion of much less radial diameter. Consequently as the cam rotates the increasing radial portion of the cam causes the roller and the arm 48 to oscillate up and down. The opposite arm 53 of the crank-arm extends substantially vertically upward from the crank-arms pivotal supporting-shaft 4:6 In its upper end 54 a slot 55 is formed, in which is slidably and adjust' ably secured a buffer-block 56. This bufferblock comprises a head portion 57, from which extends a bolt portion that projects through the slot 55 from the outside of the rockarm. The end of the bolt portion is threaded and carries a nut 58, by which the bufferblock is secured in the slot at any desired position. This buffer-block rests against a bufier-plate 59, which is bolted to the headend rail 5 of the table and is held against the buffer-plate under an adjustable tension by an adjustable expansion-spring and a rod 61, which is pivotally connected atone end to an eye 62, formed in one end of a strap 63, that projects from the head end of the table, the opposite end of which is secured to the table by bolts 64. The rod 61 extends loosely through and beyond the top central portion of the yoke 43 of the bed-plate. A cupped flange 65 is mounted loosely on the rod. The center of this flange is provided with a projecting rib 65 which fits into and bears against a recess 65 formed in the adjacent side of the standard. The coiled expansionspring 60 surrounds the rod, and one end extends loosely into the cupped flange 65. The opposite end of the spring 60 also fits loosely into a cupped flange 67, which isalso loosely mounted on said rod. The free end of the rod is threaded, and a nut 67 is threaded to it and is adapted to screw the flanges and the spring against the standard which draws the table against the bufferblock. The tension of the spring can be regulated by the nut to impart to the table as quick and vigorous return strokes as desired. This driving mechanism imparts to the table a slow forward movement toward its discharge end, which is called the forward stroke of the table, and aquick-return stroke toward the head end of the table, which is called the return or backward stroke. It is the backward stroke that moves the orepulp and the concentrates from the head end of the table, where they are fed onto the table, toward its discharge end. The slow forward stroke is made by the gradually-increasing radial portion that comprises three-quarters of the peripheral surface of the cam and which, rotating in the direction of the arrow 68, raises the roller and arm and pushes the table forward. The quick-return or backward stroke is made the one-quarter portion of the cam that is of the least radius from the center, which allows the roller to fall and the rock-arm to jump back away from the table, thus permitting the spring to jerk the table back on its backward stroke. The tension of the spring should be adjusted to jerk the table back just as fast as the onequarter recess portion of the cam will permit the rock-arm to be jerked back by the spring, so that the table will always be in touch with the buffer-block of the rock-arm, and thus avoid any knocking or pounding between the two at the reversing of their movements. The vertical adjustment of the bufier-block 56 in the slot 55 of the arm 53 of the rockarm permits of a reciprocal movement for the table, varying from about a quarter of an inch to an inch and a half, these being practically the extreme limit of short and long strokes that will be used.

The shaft 45 of the cam extends through the driving mechanism on both sides. On the outside end a fly-wheel 68 is secured. The opposite end of the shaft extends across the supporting-sills of the driving mechanism and is the 'main driving-shaft for all the driving mechanisms of all the tables in the concentrator. This shaft is supported in boxes 69 and 7 0. Upon the end of this shaft opposite the table 1 a stepped cone-pulley 71 is secured, which is adapted to be connected by a belt 7 2 to a similar stepped cone-pulley 73, which is secured to the shaft 74: of the driving mechanism of the table 3. A stepped conepulley 7 5 is also mounted on the shaft 45 in line with a cone-pulley 76, that is secured to the end of the shaft 7 7 of the driving mechanism of the table 2, which is adapted to be driven by a belt 78 from it.

Tight and loose pulleys 7 9 and 80, respec-- tively, are operatively mounted on the main driving-shaft 45 close to the driving mechanism of the first table, and a belt 81 extends from the loose pulley 80 to a suitable source of power.

Under the discharging-apron 8 of each concentrating-table I place a box 81, into which the concentrates drop from the apron, and across the top, close to the side of the box adjacent to the apron, I secure a strip of wood 82. The space between this strip 81 and the top edge of the adjacent side of the box forms a slideway for'an inclined chute 83, which I term a separator. This separator comprises a chute having sides 84 and 85, between which there is an inclined floor 86, which extends from the top corner of the end of the chute nearest the feed side of the table to the lowest corner of the opposite end of the sides. To the outside of the sides of this chute angled strips 87 and 88 are secured, one of the arms of which is secured to the sides, and the other arms extend outward and rest on top of the strip 82 and the top edge of the concentrates-box, while the body of the separator fits loosely and slidably between them.

The operation of my multiple-table concentrator is as follows: The ore-pulp, which is pulverized ore mixed with sufficient water to form a flowing stream, is fed into the hopper through a suitable launder from stamps, Huntington mills, rolls, or any other suitable orepulverizing machinery, by which it is crushed to the required fineness, usually from about forty to eighty mesh,and flows from the hopper across the table in substantially a diagonal direction from the hopper to the opposite corner of the table at the lower end of the side discharging-apron 11. This diagonal path of travel of the ore-pulp is caused by two forces first, the longitudinal reciprocative movement of the tables imparted to them by their driving mechanism, and, second, the flow of the clear wash-water from the pipes at the feed side rails, aided by the inclination of the table, which tends to carry the ore-pulp transversely across the tables. Thus the resultant path of travel of these two forces is diagonally across the table from the hopper. This diagonal line of travel can, however, be varied several degrees by tilting the tables. Each table requires adiflerent tilting angle from the other and also a diflerent quantity of clear wash-water, even on the same ore, as the quantity of middlings ore-pulp flowing onto the second and third tables is much less than that which flows constantly on the first. The tables also require different inclinations for ores of different characters and specific gravities in order to attain the best separation and concentration of the mineral particles. The flow of clear water is regulated by the valve in each tables water-supply pipe, and the tilting inclination of each table is adjusted by each tables hand-wheels and tilting-rods, while the reciprocal movement is adjusted by the adjustment of each tables driving mechanism. As the ore-pulp flows across the first table the rapid reciprocative movement of the table, which may vary from about two hundred and twenty-five to three hundred reciprocations per minute,

causes the mineral particles to settle and stratify into the cups and onto the surface of the table between the cups, from which they work into the rifile and cups as they move across the table and settle in them and gradually Work along from cup to cup through the riffle of each row of cups to the end of each row and out of the last cup onto the table, from which they feed along and drop off of the apron into the concentrates-box. That portion of the ore-pulp that flows to the discharge side of the table between the head end of the apron and the head-end rail of the table is tailings or gangue and should be entirely devoid of mineral and discharges into the launder and discharges from the launder through the aperture 11 and is led to waste. That portion of the ore-pulp that flows across the apron onto the second table is called mid.

dlings and consists of ore-pulp that still retains mineral particles that were not separated from the ore-pulp in its movement across the table. This product as it flows in the second table becomes middlings ore-pulp, as it is just as much ore-pulp as the material that first flowed onto the first table from the hopper except that the ore-pulp that flowed across the first table has lost a portion of its mineral particles, which have been concen' 'ment to properly concentrate it than that required for the first table. As this middlings ore-pulp flows across the second table the mineral particles settle into the cups and riffles of the different rows of cups and onto the surface of. the table between the cups, from which it moves either into the cups or riflies, and from them it works to the discharge end of thetable and discharges from the apron into the concentrates-box 81 as clear concentrates. The material that flows to the discharge side of the second table, between the head end 83 of the apron 84: and the head end 85 of this table, is tailings, and the material that flows over the apron 84 is middlings of the middlings orepulp that flowed from the first table and the concentrates. The third table receives this second-grade middlings ore-pulp from the second table and concentrates in like manner to the first table; but as this material is the first part of the middlings ore-pulp that flowed onto the second table the third table will also require independent adjustment of reciprocal stroke, speed, and tilt of table and quantity of water to properly concentrate it. The entire product that flows across this third table flows into the discharge side of this third table as tailings and flows into the launder 86 and to waste. The concentrates that collect in the cups and riffies flow to the discharge end and discharge from the apron into the concentrates-boX 81.

Should the ore-pulp contain two or more different metals, as iron and zinc, or lead and zinc, or lead and iron, or iron and copper and it is desired to separate one from another, the separator is moved along the box under the apron to the line of contact of the two metal concentrates on the discharge edge of the apron. The concentrates of one of the metals that is nearest to the feed-side rail of the table or tables will drop into the box, and the concentrates of the other metal will drop onto the top edge of the separator and will run down its inclined chute and also drop into the same box, but at a distance from the contrates dropping into the box of the other metal. The concentrates of any two metals can be thus separated in the concentrates-box.

One of-the most valuable features of my multiple-table concentrator is that the Stratifications or beddingof the ore-pulp and mineral particles in the pulp that takes place inthe ore-pulp by the time it reaches the middlingsapron of the first table and flows onto the second and third tables are not broken or mixed up, as the aprons are made wide enough to receive the entire middlings portion of the ore-pulp and to deliver it in a wide thin sheet.

onto the second and third tables just as it stratifies on the first and on the second tables,

second and third tables in the best possible condition to make a perfect separator and concentration of the very finest mineral particles, and especially of the slimes in the orepulp.

When an ore-pulp is being concentrated that contains free gold, I place in the bottoms of the cups a quantity of mercury, into which the free gold works and with which it amalgamates. This mercury is prevented from being worked out of the cups by the upward inclination of the .rifile from its head end to its discharge end, which causes any mercury that works out of the recesses in the bottom of the cups to flow backward into them.

In Fig. l I have illustrated the rows of cups and their connecting-rifl les arranged in rows of different lengths. Thus the row nearest the feed-side railis the shortest, the second and thirdrows containthe same number of. cups, and the second row is positioned slightly ahead of the first row at its discharge end and backward or behind it at its head end, the third is positioned ahead of the first and sec 0nd at its discharge end and even with the first at its head end, while the fourth row is larger. than the other three and is positioned to extend beyond the third, while in Fig. 4 the first and third are of even length, and so, also, are the second and fourth, but are larger than the first and third, and their terminal cups and ends all terminate in alinement with each other.

My invention contemplates any arrangement of order or position of the rows of cups in a tables surface, as they are independent of each other.

While I have illustrated and described the preferred construction of my multiple-table concentrator, I do not wish to be limited to the exact construction and arrangement shown, as there are many changes that might be made without departing from the spiritlof:

; my invention. I

eral rows of invertedconical'cups extending from the head-end portion of the table, throughout aportion of each tables length,. each row of cups being connected together with a sunken groove or rifl'le, substantially as described.

2. In a reciprocating table-concentrator, a-

Iflat table portion provided-with tapering rows "of inverted conical cups extending fromthe head end of eachtable longitudinally of their length a predetermined distance, eachrow of .cups being connected together by asunken riflie that is deepest at the hcad-endcup and: tapers upward to the last cup in each-row, substantially as described.

which permits it to move and feed across the 3.- In a reciprocating-concentrator, .aitable lcomprising aflat surface provided-with several tapering rows of cup-shaped recesses-extending from the head-end portion of each table to near their discharge ends,v and a. grooved rifiie formed from the center of the 1 head-end cup to-the center of the dischargeend cup of each row and arrangeddeepest at. the head-end cup end, tapering shallow in. depth to the discharge-cups of each row, substantially as described.

ards at each end of said table, atiltingmech anism secured operatively to the standards of said table and arrangedto operatively adjust the inclination of said table, asuitable reciprocal driving mechanism operatively secured; to said table, and an independent clear-watersupply-pipe system operatively arranged on: said table, substantially as described.

5. In a reciprocating concentrating-table, a table comprising afiat table portion,.a plurality of tapering rows of cups on said table, each cup containingarecessin its bottom, each. cup and recess tapering shallow fromthe head end of the table to the end of each row of cups, and. each cup in each row connected by a tapering riffle extending fromone cuptothe other throughout each row of cups, said riflie being deepest at the head end of each row of cups and extending from the surface of the table to the top of the recesses in, the

bottom of each'cu p, and tapering upward from the head-end cup to the discharge-end cup of each row, substantially as described.

6. In a reciprocating concentrator, a table comprising a flat surface, a side rail along the feed side of said table and a rail along the head or feed'end of said table and an open discharge side and end, a discharge-apron projecting from the discharge end of said table, a plurality of tapering rows of cup-shaped recesses in the surface of said table extending from the head end of said table toward its discharge end, arranged in any predetermined order, a rifiie extending through said rows of cups from end to end of each row, said rifl'le and said cups tapering shallower from the head end of said table and of each row of cups to the discharge end of each row of cups in depth and said cups also tapering in width and a recess in each cup below said riflfle, substantially as described.

7. In a reciprocating concentrating-table, a table comprising a flat table-surface, a plurality of rows of recesses connected by a relatively narrow grooved rifiie extending through said recesses from end to end of each row of cups and extending from the head end of said table at variable angles toward the discharge end and side of said table, means for feeding ore-pulp to said table and means for supplying clear water to said table, substantially as described.

8. In a reciprocating concentrating-table, a flat table provided with a plurality of sunken rifiies and cupped recesses extending longitudinally from the head end of said table to near its discharge end and arranged in varying angles from its feed side and head-end corner to its discharge end and discharge-side corneracross the table to its discharge side, the discharge ends of said rows of cups and riffles being arranged in any suitable order, said riffles tapering upward in depth from their head ends to their discharge ends, a plurality of inverted conical shaped recesses formed in said tables surface centrally of and intersecting each riffle, said recesses decreasing in diameter and depth from the head end of each rifi'le to its discharge end, and arranged and adapted to collect concentrates and discharge them on the discharge-end portion of said table, means for feeding ore-pulp to said table and means for flowing a supply of clear water on said table, substantially as described.

9. In a reciprocating concentrating-table, the combination of a flat-top table provided with a plurality of rows of sunken recesses of decreasing Width and depth and united by a sunken groove or riiiie extending from one end of said rows of recesses to their oppositeencls, said rows being arranged in successive oblique angles longitudinally of the table commencing at the feed-side rail with a sharp, oblique-angle row of recesses and each row of less oblique longitudinal angle to the discharge side of the table where the last row is substantially parallel with the discharge side of the table and having said combined recesses and riffles decreasing in depth upward from their ends at the head end of said table to their discharge ends in the discharge end and having the discharging-cups of said rows of cups and riffies arranged in any suitable order, said recesses and rifl-les adapted to collect and dis charge their contents onto the discharge-end portion, and a mercury-holding cavity in the bottom of each recess below said riflie, means for feeding ore-pulp to said table and means for feeding clear water to said table, substantially as described.

10. In a reciprocating concentrating-table, the combination of a table comprising a flat table portion provided throughout a portion of its surface with a plurality of rows of inverted conical recesses or cups tapering in width and depth and extending from the head end of said table throughout the greater portion of the tables length, each row of recesses being connected together by a grooved rifiie extending centrally through each row of recesses with vertical standards pivotally supported on a knife-edge, blocks, vertically-adjustable knife-edge rods slidably supported in the opposite corners of said standards, knife-edge bearing-boxes secured to the under side of said table and resting on said knifeedge, vertically-adjustable rods, means for raising and lowering said rods to adjustably tilt said table, and means for reciprocating said table whereby said table is reciprocally and tiltingly supported on oscillating pivotal supports, substantially as described.

11. In a reciprocating concentrating-table, a table comprising a table containing a head end and discharge end and a feed side and discharge side and a flat table-surface provided with a plurality of rows of tapering invertedcone-shaped recesses or cups extending in predetermined order and arrangement over its surface from its head end to its discharge end, each recess containing a pocket extending deeper into the surface of the table from the bottom of its central portion provided with a grooved riflie extending through the center of said inverted conical-shaped recess from the surface of said table to the tops of said pockets, said rows of combined recesses, riflies and pockets tapering in depth from the head end of said table to their discharge ends where they are arranged and adapted to discharge their contents on the flat surface of the discharge-end portion of said table, an overhanging apron along the discharge end of said' table, an apron projecting from the discharge side of said table extending from the tables discharge end toward its head end a predetermined distance and adapted to lead from said table portion of said tables contents to In testimony whereof I affix my signature in presence of two witnesses.

ABEL GUIONNEAU.

Witnesses:

G. SARGENT ELLIOTT, OHARLEs M. FUELLER'. 

